Hong Kong is built on both sides of the harbour. On one side is Hong Kong Island, with its famous skyline of skyscrapers packed tightly up the hillsides. On the other side is Kowloon, a busy urban area on the mainland. The harbour divides them - but ferries, tunnels and bridges keep them joined.
Every night at eight o'clock, many of the buildings light up together in a show called the Symphony of Lights. Music plays, and the towers flash different colours in time. It is one of the biggest permanent light shows in the world.
Victoria Harbour is one of the deepest natural harbours anywhere - big ships can sail right into it without difficulty. For hundreds of years it made Hong Kong an important place for trading, because goods could arrive by sea from all directions.
Looking across the harbour from Tsim Sha Tsui, visitors can count hundreds of skyscrapers all at once. Hong Kong has more buildings taller than 150 metres than any other city on Earth. Space is precious here, so almost everything is built upwards.